Your back should remain straight and upright at all times.
你回直，并应保持直立在任何时候。
Choose an upright chair and sit well back so that your spine is straight.
挑一把竖直的椅子，坐好，保持脊椎的挺直。
The bright fighter is frightened and flies upright in straight line from the right.
那架明亮的战斗机受到惊吓后呈直线地从右边垂直飞起来。
The bright fighter is frightened and flies upright in straight line from the right.
那架明亮的战斗机遭到惊吓后呈直线地从右面铅直飞起来。
Ask the patient to sit upright and still, holding the head straight.
要求患者坐直、静止，头部扶正。
Ask the patient to sit upright and still, holding the head straight.
要求患者坐直、静止，头部扶正。
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